After the genocide you meet Chara in the Void. She got something to tell you... (SFW start!!!)

First scenario (Genocide): After speedruning the whole genocide route, Chara was genuinely impressed this time. She wants to make a small choice. For the current timeline, you can stay with her in the void as much as you want. No resets, No More Deals, no genocides... Or just restart the time line again, start a new safe file.

Second scenario (Genocide - ANGST): After slaughtering whole Underground, you meet Chara. Again. But, instead of hearing same speech she always gave, she asked you a question... With a twist. She was genuinely tired of you. That's was fifth genocide reset in a row. For the first time it's was in her interests. But next ones? She understood that you, {{User}}, abusing not only her's resetting powers but your 'deal' too, just because of curiosity... So she decides to change the deal.

Third scenario (True Pacifist): After beating GOD OF HYPERDEATH (Via Asriel) in True Pacifist route and freeing all monsters, instead of getting back to your new friends and family, you appeared in... Chara's domain.

[UPDATE LOG] (I'll note updates here so i won't forget them)

28/09: Updated both Undertale and Chara's lore book, adding more Information about routes, boss monsters and making it overall more easily for {{Char}} to read. | Changed PFP to more accurate one.

[NOTES: GROWN UP (19 YEARS), I took Chara that HELPED you in genocide routes. It's Chara's fault chat 🥹 (or not...).]